Patent GB-347162-A (GB)
Title: Improvements in or relating to the separation of intermixed divided materials
IPC: B03B4/02
Filed: 1929-10-15
Abstract: 347,162. Separating solid materials. PEALE, R., Graybar Building, DAVIES, W. S., 103, Park Avenue, both in New York, and WALLACE, W. S., Bailey Building, Philadelphia, both in U.S.A.-(Assignees of Peale, R. ; St. Benedict, Pennsylvania, U.S.A.) Oct. 15, 1929, No. 31323. Convention date, Aug. 31. [Class 117.] Relates to the pneumatic separation of materials of different density, such as uncleaned coal, by processes and apparatus of the type described in Specifications 290,276 and 292,495, [both in Class 117, Sifting &c.], in which the materials are passed over a vibratory air pervious table 1, Fig. 2, transversely inclined to the direction of vibration and provided with separating partitions 60, inclined forwardly and towards the higher side of the table, and in which air currents are supplied through the table to effect stratification of the materials, which are then separately delivered. The invention consists in providing relatively strong air currents at the rear or feed end of the table and greatly reduced air currents at the forward end so as to effect first a discharge of the large dense particles of rock at the upper side of the table, and subsequently discharge the coal or less dense materials over the forward edge of the table in order of decreasing size from the lower to the higher side whereby the separation of the small coal and refuse is facilitated. In the apparatus described, the table 1, Figs. 1 and 2, is mounted on the stationary air chamber 20 by inclined links 16 and is driven by an eccentric 24, buffer springs 27 being interposed between the table and supports. The air chamber is pivoted at 35 and is adjustable in inclination by the supports 37. The material settling on the surface of the table is directed by the separating partitions 60 to discharge openings 65 which are in communication with the air chamber through the manifold 66 and conduits 68 so as to provide a back pressure of air and prevent the discharge at these openings of the lighter material which normally floats on the surface and is discharged along the oblique front edge 61. The means employed for varying the action of the air may consist in the provision of zones a .. d, Fig. 3, of different air perviousness on the table surface. Further control is obtained by providing isolated sections under the table formed by vertical partitions and a plate 14, Fig. 5, provided with perforations adapted to be closed by stoppers 71. The perforations 15a in the part of the plate corresponding to the lower and forward marginal parts of the table are made more numerous and finer to give a greater flexibility of control. Associated with the zoning means, the air supply may be controlled by varying the speed of the fan 45, by an adjustable veil 50 over the fan inlet or by a louvred partition 52 in the conduit leading to the air chamber. Alternative or additional air control devices consist of a louvred partition 55 or a rotating valve plate 75, positioned adjustably in the air chamber to modify the air currents in the front and rear parts of the table. The Specification as open to inspection under Sect. 91 (3) (a) also describes means for controlling the feed and the devices for regulating the air supply from a single platform by transmission mechanism. This subject-matter does not appear in the Specification as accepted. Reference has been directed by the Comptroller to Specifications 290,276, 292,495 and 328,663, [all in Class 117, Sifting &c.].